Post-inflationary quantum fluctuations of two scalar fields can form a three-dimensional soliton foam of closed domain walls, string-bounded walls, and scalar radiation, without a thermal phase transition.
Topology of cosmic domains and strings
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Soliton foam formation in the early Universe
Post-inflationary quantum fluctuations of two scalar fields can form a three-dimensional soliton foam of closed domain walls, string-bounded walls, and scalar radiation, without a thermal phase transition.